/*
 * Copyright (c) 2023 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


declare function AssertType(value: any, type: string): void;
declare function print(arg0: any, arg?: any): string;

const target = "ts";
let extensions: string[] = ["js", "ts", "ets"];

for (let i = 0; i < extensions.length; i++) {
    AssertType(extensions[i], "string");
}

class FileItem {
    ext:string;
    constructor(extension: string) {
        this.ext = extension;
    }
}

function reportFail() {
    print("Failed to find target.")
}

function createFile(ext: string) {
    let f = new FileItem(ext);
    AssertType(f, "FileItem");
    print("Create file item successfully!");
}

let foundExt:string = extensions.find((u) => u == target);

if (!foundExt) {
    AssertType(foundExt, "string");
    reportFail();
} else {
    createFile(foundExt);
}
